iOS开发Label文字显示位置（上、中、下）
在系统自带的UILabel中是没有吸顶及吸底部的方法的（如果有请告诉我，我没找到），于是乎重写label
1 // 2 // gzhVerticalAlignmentLabel.h 3 // VerticalAlignmentLabel 4 // 5 // Created by 郭志贺 on 2020/6/1. 6 // Copyright © 2020 郭志贺. All rights reserved. 7 // 8 9 #import <UIKit/UIKit.h>10 11 NS_ASSUME_NONNULL_BEGIN12 13 typedef enum VerticalAlignment {14 15 VerticalAlignmentTop,16 17 VerticalAlignmentMiddle,18 19 VerticalAlignmentBottom,20 21 } VerticalAlignment;22 23 @interface gzhVerticalAlignmentLabel : UILabel{24 25 @private VerticalAlignment verticalAlignment_;26 27 }28 29 30 31 @property (nonatomic, assign) VerticalAlignment verticalAlignment;32 33 @end34 35 NS_ASSUME_NONNULL_END 1 // 2 // gzhVerticalAlignmentLabel.m 3 // VerticalAlignmentLabel 4 // 5 // Created by 郭志贺 on 2020/6/1. 6 // Copyright © 2020 郭志贺. All rights reserved. 7 // 8 9 #import "gzhVerticalAlignmentLabel.h"10 11 @implementation gzhVerticalAlignmentLabel12 13 @synthesize verticalAlignment = verticalAlignment_;14 15 16 17 18 - (void)setVerticalAlignment:(VerticalAlignment)verticalAlignment {19 20 verticalAlignment_ = verticalAlignment;21 22 [self setNeedsDisplay];23 24 }25 26 27 28 - (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines {29 30 CGRect textRect = [super textRectForBounds:bounds limitedToNumberOfLines:numberOfLines];31 32 switch (self.verticalAlignment) {33 34 case VerticalAlignmentTop:35 36 textRect.origin.y = bounds.origin.y;37 38 break;39 40 case VerticalAlignmentBottom:41 42 textRect.origin.y = bounds.origin.y + bounds.size.height - textRect.size.height;43 44 break;45 46 case VerticalAlignmentMiddle:47 48 49 default:50 51 textRect.origin.y = bounds.origin.y + (bounds.size.height - textRect.size.height) / 2.0;52 53 }54 55 return textRect;56 57 }58 59 60 61 -(void)drawTextInRect:(CGRect)requestedRect {62 63 CGRect actualRect = [self textRectForBounds:requestedRect limitedToNumberOfLines:self.numberOfLines];64 65 [super drawTextInRect:actualRect];66 67 }68 69 @end使用方式
1 // 2 // ViewController.m 3 // VerticalAlignmentLabel 4 // 5 // Created by 郭志贺 on 2020/6/1. 6 // Copyright © 2020 郭志贺. All rights reserved. 7 // 8 9 #import "ViewController.h"10 #import "gzhVerticalAlignmentLabel.h"11 12 /** 屏幕高度 */13 #define ScreenH [UIScreen mainScreen].bounds.size.height14 /** 屏幕宽度 */15 #define ScreenW [UIScreen mainScreen].bounds.size.width16 17 @interface ViewController ()18 19 @property(nonatomic,strong)gzhVerticalAlignmentLabel * topLabel;20 @property(nonatomic,strong)gzhVerticalAlignmentLabel * centerLabel;21 @property(nonatomic,strong)gzhVerticalAlignmentLabel * bottomLabel;22 23 @end24 25 @implementation ViewController26 27 - (void)viewDidLoad {28 [super viewDidLoad];29 // Do any additional setup after loading the view.30 31 _topLabel = [[gzhVerticalAlignmentLabel alloc]initWithFrame:CGRectMake((ScreenW-200)/2.0, 100, 200, 80)];32 _topLabel.verticalAlignment = VerticalAlignmentTop;33 _topLabel.backgroundColor = [UIColor redColor];34 _topLabel.font = [UIFont systemFontOfSize:15];35 _topLabel.textAlignment = NSTextAlignmentCenter;36 _topLabel.text = @"文字顶部显示";37 [self.view addSubview:_topLabel];38 39 _centerLabel = [[gzhVerticalAlignmentLabel alloc]initWithFrame:CGRectMake((ScreenW-200)/2.0, CGRectGetMaxY(_topLabel.frame)+10, 200, 80)];40 _centerLabel.verticalAlignment = VerticalAlignmentMiddle;41 _centerLabel.backgroundColor = [UIColor redColor];42 _centerLabel.font = [UIFont systemFontOfSize:15];43 _centerLabel.textAlignment = NSTextAlignmentCenter;44 _centerLabel.text = @"文字中间显示";45 [self.view addSubview:_centerLabel];46 47 48 _bottomLabel = [[gzhVerticalAlignmentLabel alloc]initWithFrame:CGRectMake((ScreenW-200)/2.0, CGRectGetMaxY(_centerLabel.frame)+10, 200, 80)];49 _bottomLabel.verticalAlignment = VerticalAlignmentBottom;50 _bottomLabel.backgroundColor = [UIColor redColor];51 _bottomLabel.font = [UIFont systemFontOfSize:15];52 _bottomLabel.textAlignment = NSTextAlignmentCenter;53 _bottomLabel.text = @"文字底部显示";54 [self.view addSubview:_bottomLabel];55 }56 57 58 @end 
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